Rib and rib-joint for umbrella and parasol frames.



Nd. 874,799. PATENTED DEC. 24, 1907. F. W. SGHROEDER.

RIB AND RIB JOINT FOR UMBRELLA AND PARASOL FRAMES.

APPLICATION FILED MAY 7. 1907.

FREDERICK WILLIAM SGIIROEDER, OF STRAND, LONDON, ENGLAND.

RIB AND RIB-JOINT FOR UMBRELLA AND PARASOL FRAMES.

Specification of Letters Patent.

Patented Dec. 24, 1907.

Applicationfiled May '7, 1907- Serial No. 372,402.

T 0 all whom it may concern:

Be it known that I, FREDERICK WILLIAM. SOHROEDER, a subject of the King of Great Britain, residing at 9 Arundel street, Strand, in the county of London, England, engineer, have invented certain new and useful Imrovements in Ribs and Rib Joints for Umbrella and Parasol Frames, of which the following is a specification.

This invention relates to an improvement in the construction of U-shaped ribs for umbrella and parasol frames and to improved constructions of oints for connecting the stretcher ribs to the frame ribs, whereby the ribs are enabled to lie more compactly together when closed and the joints are rendered less liable to wear out the fabric of the umbrella or parasol.

In the accompanying drawings Figure 1 shows a perspective view of one construction of joint with the parts assembled as applied to the improved construction of rib according to the present invention, Figs. 2, 3 and 4 show details of this joint to an enlarged scale, and Fig. 5 shows a cross section of the said oint with the parts assembled together; Fig. 6 shows the improved construction of joint with the parts assembled when applied to an umbrella U rib of ordinary construction.

The improvement in the construction of the grooved rib consists in manufacturing this of thinner metal, the strengthening thereof being effected by grooving, corrugating, or ribbing both sides of the grooved rib a along its entire length as shown at a in Figs. 1, 2 and 5.

In the case of the employment of a ribbed,

grooved or corrugated U-shaped rib such as above referred to, the joint is constructed as shown in Figs. 1 to 5. The outer end of the U-shaped stretcher rib b which may also be grooved or corrugated, is pressed together, and a small hole a is drilled or punched at the end thereof.v This is then placed in a piece of sheet metal (Z doubled over on itself, forming a U-shaped piece, the sides of which are of greater depth than the corrugated grooved rib a. This piece of sheet metal may also be corrugated so as to form a fib d on each side when doubled over on itself (Fig. 5) or it may simply have holes indented on it so as to form outer projections d on each side (Fig. 3), which ribs (1 or projections d fit into the groove (1 when the piece cl is slid into the grooved rib a.

As shown in Figs. 1, 3 and 6, the sides of the joint piece (1 extending beyond the edge of the main rib may be formed with shoulders d abutting on the edges of the sides of the rib a.

The parts having been assembled as shown in Figs. 1 and 5, an indentation or hole 6 is punched on each side opposite the hole 0 of the stretcher rib, in such a manner that the metal burs or edges of these holes e protrude into the hole 0, thus forming a pivot on which the stretcher rib b can be moved backwards and forwards.

The indenting or punching of the hole e is also arranged to be punched in such a position as to indent or punch in at the same time the edge of the outer grooved rib a which prevents the longitudinal movement of the hinged joint, its movement outwardly from the rib a being prevented by the ribs (1 or projections 01 being held by the groove 0/.

When a U rib of ordinary construction is employed, as in Fig. 6, the U-shapedpiece (1 is made without the ribs (1 or projections d but of somewhat greater length with indentations or holes (1 at each end, and when placed in position is secured from both longitudinal and outward movement in the rib by indenting the sides of the outer rib at f opposite the end holes' or indentations in the piece (1.

Having thus described the nature of this invention and the best means I know of carrying the same into practical effect, I claim 2- 1. In umbrella frames a main rib of substantially U-shaped section, a joint piece of substantially U-shaped section adapted to fit within the said rib, but having its sides projecting beyond the edges of the sides of the rib, locking indentations in the sides of the rib and of the joint piece, inwardly projecting indentations in the projecting portion of the joint piece, and a stretcher rib having its end formed to engage pivotally with the said inwardly projecting indentations substantially as described.

2. In umbrella frames, a rib of substantially U-shaped section but having the sides thereof formed with longitudinal corrugations to strengthen said rib; substantially as described.

3. In umbrella frames, a main rib of substantially U-shaped section but having the sides thereof formed with longitudinal corrugations, a joint piece of substantially U- shaped section adapted to fit within the said rib and having indentations engaging the said corrugations, a stretcher rib having a transverse hole formed in the end thereof, and inwardly projecting indentations in the sides of the joint piece engaging the hole in the stretcher rib; substantially as described.

4. In umbrella frames, a rib of substan: tially U-shaped section but having the sides thereof formed with outwardly projecting longitudinal corrugations, a joint piece of substantially U-shaped section having outwardly projecting longitudinal corrugations engaging the corrugations in the rib, said joint piece being inclosed within the sides of the rib but having its sides extending beyond the edges of the sides of the rib, andhaving shouldered portions abutting on the said edges, inwardly projecting indentations in the said shouldered portions of the joint piece, and a stretcher rib having its end formed to engage pivotally with the said inwardly projecting indentations; substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FREDERICK WILLIAM SCHROEDER.

Witnesses:

J OSEPH MILLARD, WALTER J. SKERTEN, 

